含DCPFC的混合直流/交流联合电网无功优化

Reactive power optimization of hybrid DC/AC combined power grid considering DCPFC

基于电流源换流器(current source converter,CSC)及电压源换流器(voltage source converter,VSC)的混合直流/交流联合电网输电技术是解决大规模、远距离电能输送和新能源并网的有效手段之一.本文首先建立了计及电压下垂控制方式和直流潮流控制器(DC power flow controller,DCPFC)的直流网络稳态模型,在此基础上构建了考虑VSC精确损耗的混合直流/交流联合电网无功优化模型.通过算例仿真,分析了交流系统发电机组出力、VSC电压下垂参数以及DCPFC变比对联合电网有功损耗的影响.研究结果表明,优化VSC电压下垂参数及DCPFC变比对降低全网有功损耗有重要作用.

Hybrid DC/AC combined power grid transmission technology based on current source converter(CSC)and voltage source converter(VSC)is one of the effective means to solve large-scale,long-distance power transmission and new energy grid connection.Firstly,the DC network steady-state model considering the voltage droop control method and DC power flow controller(DCPFC)is established.Based on this,a reactive power optimization model of hybrid DC/AC combined power grid considering the accurate loss of VSC is constructed.Through the simulation of the example,the influences of the AC system generator set output,the VSC voltage droop parameter and the DCPFC variable ratio on the active loss of the combined power grid are analyzed.Research result shows that the optimization of VSC voltage droop parameter and DCPFC variable ratio has an important effect on reducing the active loss of the whole network.